Acroread7 doesn't work because
/emul/linux/etc/opt/gnome/gtk-2.0/gdk-pixbuf.loaders
is empty.
grep gdk-pixbuf.loaders /var/db/pkg/*/+CONTENTS
/var/db/pkg/suse_gtk2-9.1nb3/+CONTENTS:emul/linux/etc/opt/gnome/gtk-2.0/gdk-pixbuf.loaders

So I reinstall suse91_gtk2, and because I have PKG_DEVELOPER set, I
find out about PLIST unhappiness.
===> Checking file-check results for suse_gtk2-9.1nb3
*** The PLIST does not match installed files!
*** The following files are in the PLIST but not in /usr/pkg:
        /usr/pkg/emul/linux/etc/opt/gnome/gtk-2.0/gdk-pixbuf.loaders
	/usr/pkg/emul/linux/etc/opt/gnome/gtk-2.0/gtk.immodules
	/usr/pkg/emul/linux/etc/opt/gnome/pango/pango.modules

(I also notice 
/usr/pkg/emul/linux/opt/gnome/bin/gtk-query-immodules-2.0: error while loading shared libraries: libgdk_pixbuf-2.0.so.0: cannot enable executable stack as shared object requires: Permission denied
/usr/pkg/emul/linux/opt/gnome/bin/gdk-pixbuf-query-loaders: error while loading shared libraries: libgdk_pixbuf-2.0.so.0: cannot enable executable stack as shared object requires: Permission denied
but don't know if they matter.)

To get acroread7 working, I need to add:
"/emul/linux/opt/gnome/lib/gtk-2.0/2.2.0/loaders/libpixbufloader-xpm.so"
"xpm" 0 "gtk20" "The XPM image format"
"image/x-xpixmap" ""
"xpm" ""
"/* XPM */" "" 100

but that won't necessarily fix other apps that use this thing.

Running the native version of gdk-pixbuf-query-loaders will get you
an example of what goes in the
/emul/linux/etc/opt/gnome/gtk-2.0/gdk-pixbuf.loaders
file, if you want to be complete.

Running the linux version gets you:
% /usr/pkg/emul/linux/opt/gnome/bin/gdk-pixbuf-query-loaders
/usr/pkg/emul/linux/opt/gnome/bin/gdk-pixbuf-query-loaders: error while loading shared libraries: libgdk_pixbuf-2.0.so.0: cannot enable executable stack as shared object requires: Permission denied

I suppose I'll put this in a PR later, but I don't know how to actually
fix this yet, any hints?

I still get a lot of WARNINGs & CRITICALs from acroread7 when I run it,
but it seems to work like this.

(Thanks to Jason White for digging all this up.)

-Tracy